侍祭 is read as じさい (jisai) and means acolyte.
じさい
jisai
さむらい
man in attendance (on a person of high standing)
じじょ
lady attendant
じい
court physician
じじゅう
chamberlain
じえいちょう
captain of the guard
じじゅうぶかん
emperor's aide-de-camp
さむらいかたぎ
samurai spirit
じじゅうちょう
grand chamberlain
さぶらいだいしょう
samurai general (esp. during the Sengoku period)
じじゅうかん
じじゅうしょく
board of chamberlains
かんこんそうさい
important ceremonial occasions in family relationships